1、Designation: C 923 07Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals1This standard is issued under the fixed designation C 923; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specific
3、ation covers the minimum performance andmaterial requirements for resilient connectors used for connec-tions between reinforced concrete manholes conforming toSpecification C 478 and pipes, between wastewater structuresand pipes, and between precast reinforced concrete pipe andlaterals.1.1.1 These c
4、onnectors are designed to minimize leakagebetween the pipe and manhole, and between the pipe andlateral.1.2 A complete metric companion to Specification C 923has been developedC 923M; therefore, no metric equivalentsare presented in this specification.NOTE 1This specification covers the design, mate
5、rial, and perfor-mance of the resilient connection only. Connections covered by thisspecification are adequate for hydrostatic pressures up to 13 psi (30 ft)without leakage when tested in accordance with Section 7. Infiltration orexfiltration quantities for an installed system are dependent upon man
6、yfactors other than the connections between manhole structures and pipe,and allowable quantities must be covered by other specifications andsuitable testing of the installed pipeline and system.1.3 The following precautionary caveat pertains only to thetest methods portion, Section 7, of this specif
7、ication: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use. For a specif
8、ic precaution statement, see7.2.5.2. Referenced Documents2.1 ASTM Standards:2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA 666 Specification for Annealed or Cold-Worked Austen-itic Stainless Steel Sheet, Strip, Plate, and Flat BarC 478 Specification for
9、 Precast Reinforced Concrete Man-hole SectionsC 822 Terminology Relating to Concrete Pipe and RelatedProductsC 913 Specification for Precast Concrete Water and Waste-water StructuresD 395 Test Methods for Rubber PropertyCompressionSetD 412 Test Methods for Vulcanized Rubber and Thermo-plastic Elasto
10、mersTensionD 471 Test Method for Rubber PropertyEffect of LiquidsD 543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD 573 Test Method for RubberDeterioration in an AirOvenD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 746
11、Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD 883 Terminology Relating to PlasticsD 1171 Test Method for Rubber DeteriorationSurfaceOzone Cracking Outdoors or Chamber (Triangular Speci-mens)D 1566 Terminology Relating to RubberD 2240 Test Method for Rubber PropertyDuro
12、meterHardnessNOTE 2For more information about wastewater structures, see Speci-fication C 913.3. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber shall be asdefined in Terminologies D 883 and D 1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelat
13、ed products shall be as defined in Terminology C 822 andas modified in 3.1.3-3.1.6.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved March 1, 2007. Published Mar
14、ch 2007. Originallyapproved in 1979. Last previous edition approved in 2002 as C 923 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summa
15、ry page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 connectorthe entire assembly including resilientseals and metallic or nonmetallic mechanical devices, if any,used therein.3.1.4 lateralthe small diamete
16、r pipe connected to themain line pipe.3.1.5 pipethe inlet or outlet pipe connected to the man-hole.3.1.6 pipe stuba short section of pipe, installed in thestructure as an inlet or outlet pipe, for future connection.4. Materials and Manufacture4.1 All materials shall conform to the following require-
17、ments:4.1.1 Resilient materials for connectors and filler rings shallbe manufactured from natural or synthetic rubber and shallconform to the requirements prescribed in Table 1. If a spliceis used in the manufacture of the seal, its strength shall be suchthat the seal shall withstand a 180 bend with
18、 no visibleseparation.4.2 Mechanical DevicesExpansion rings, tension bands,and take-up devices used for mechanically compressing theresilient portion of the connector against the pipe, manhole orwastewater structure shall be made from a material or materialsin combination that will ensure durability
19、, strength, resistanceto corrosion, and have properties that will ensure continuedresistance to leakage. All metallic mechanical devices, includ-ing castings and bolt assemblies used to mechanically deformresilient materials shall be constructed of corrosion resistantmaterials meeting the physical p
20、roperties and chemical com-position requirements of Specifications A 493 and A 666, Type302 through Type 316.NOTE 3Experience has shown that successful performance of thisproduct depends on the type of bedding and backfill and the care in thefield installation of the manhole or wastewater structure
21、and connectingpipes. The owner is cautioned to require inspection at the construction site.5. Principles of Design5.1 The design of the connector shall be such that positiveseal is accomplished at two locations: (1) between the connec-tor and the wall of the manhole or wastewater structure and (2) b
22、etween the connector and the pipe. The seal between theconnector and the wall of the manhole or wastewater structureshall be made by either mechanical means, compression of theresilient material between the outside surface of the pipe andthe pipe opening in the wall of the manhole or wastewaterstruc
23、ture, or by casting the connector integrally with the wall ofthe manhole or wastewater structure. The seal between theconnector and the pipe shall be made by mechanical means orby compression of the resilient material against the outside ofthe pipe. Resilient filler rings are not prohibited from bei
24、ngused between the pipe and the connector to provide a seal.Whichever design is used, it shall be capable of maintaining aresilient, hydrostatic seal under the performance conditions inaccordance with Section 7. Devices used to effect mechanicalseals shall conform to the requirements specified in Se
25、ction 4.5.2 For lateral to pipe connectors, the design of the connec-tor shall be such that a positive seal is accomplished at twolocations: (1) between the connector and the pipe wall and (2)between the connector and the lateral. The seal between theconnector and the pipe wall shall be made by eith
26、er mechanicalmeans, compression, or by casting the connector integrallywith the pipe wall. The seal between the connector and thelateral shall be made by either mechanical means or bycompression of the resilient material against the outside of thepipe. Resilient filler rings are not prohibited from
27、being usedbetween the lateral and the connector to provide a seal.Connector design must not allow either lateral or connector toextend past the cylindrical plane of the pipe inside diameter.The connector shall be capable of maintaining a resilienthydrostatic seal under the performance conditions in
28、accor-dance with Section 7. Devices used to effect mechanical sealsshall conform to the requirements specified in Section 4.5.3 Purchaser shall require that all pipe stubs installed, toallow for future connection to the manhole or wastewaterstructure, be mechanically restrained from movement bymeans
29、 of, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 36 in. and smaller, at least one connectorshall be tested for each 6 in. increment in diameter. Fordiameters larger than 36 in., at least one connector shall betested for each 12 in. increment in diameter.TABLE
30、1 Resilient Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D 543, at 22C for 48 h1 N sulfuric acid no weight loss1 N hydrochloric acid no weight lossTensile strength 1200 psi, min D 412Elongation at break 350 %, minHardnessB65 from the connector manufacturers specifiedhard
31、nessD 2240 (Shore A durometer)Accelerated oven-aging decrease of 15 %, max, of original tensile strength,decrease of 20 %, max, of elongationD 573, 70 6 1C for 7 daysCompression set decrease of 25 %, max, of original deflection D 395, Method B, at 70C for 22 hWater absorption increase of 10 %, max,
32、of original by weight D 471, immerse 0.75 by 2 in. specimen indistilled water at 70C for 48 hOzone resistance rating 0 D 1171Low-temperature brittle point no fracture at 40C D 746Tear resistance 200 lbf/in. D 624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared
33、from laboratory slabs or by direct molding.BThe connector manufacturer shall select the hardness appropriate for each component of the connector. Thereafter, the hardness shall comply within the tolerancesin Table 1.C9230726.2 The acceptability of the resilient connector shall bedetermined by the re
34、sults of the physical tests prescribed in thisspecification, if and where required, and by inspection, todetermine whether the connector conforms to the specificationwith regards to design and freedom from defects.6.3 When requested, a current certification shall be fur-nished as the basis of accept
35、ance. The certification shall consistof the connector manufacturers test report, or statement by themanufacturer, accompanied by a copy of the test results, thatthe resilient connector has been tested and inspected inaccordance with the provisions of Section 4 and Section 7.Each certification so fur
36、nished shall be signed by the connectormanufacturer or an authorized agent.NOTE 4Certification shall be deemed current, if it represents presentdesign, and bears a date that is no more than five years older than thecurrent date.7. Test Methods and Requirements7.1 Install a pipe(s) and the resilient
37、connector(s) to betested in the base section of a manhole or wastewater structure.Subject the assembly to the prescribed hydrostatic pressure in7.2 at the centerline of the connector for a period of 10 min. foreach test condition. Restrain the pipe against axial movementduring the tests.NOTE 5The us
38、er of this specification is advised that if manhole basesgreater than 48 in. inside diameter are required to accommodate largediameter connectors for the test, all safety requirements and proceduresshould be reviewed prior to the test.7.1.1 Install a lateral and resilient connector to be tested into
39、the pipe. Subject the assembly to the prescribed hydrostaticpressure in 7.2 at the centerline of the connector for a period of10 min. for each test condition. Restrain the lateral againstaxial movement during the tests.7.2 There shall be no leakage under any of the followingconditions:7.2.1 Straight
40、 alignment of the pipe(s)/lateral(s) subjected toa hydrostatic pressure of 13 psi (30 ft) for 10 min.7.2.2 Axial deflection of the pipe(s)/lateral(s). Uponcompletion of the test for straight alignment in 7.2.1 thepipe(s)/lateral(s) shall be axially deflected at least 7 in anydirection and subjected
41、to a hydrostatic pressure of 10 psi (23ft.) for 10 min.7.2.3 When the pipe is loaded in shear in accordance withthe requirements shown in Fig. 1 and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.4 When the lateral is loaded in shear in accordance withthe loading requirements o
42、f Fig. 1 and does not exceed 1 in. ofaxial movement at the connector and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.5 Note: Pressure is not prohibited from being relievedwhile deflecting or loading test section.7.3 Leakage shall be construed to mean freely drippingwater ema
43、nating at the interface between the connector andbase of the manhole or wastewater structure, or the pipe;between the connector and the filler rings; or through the bodyof the connector and the filler rings; or through the body of theconnector itself.7.4 Moisture appearing at random locations on the
44、 base ofthe outlet in the form of patches or beads adhering to thesurfaces shall not be considered leakage.7.5 A delay of up to 24 h is not prohibited prior to makingobservations of leakage.8. Product Marking8.1 Each connector shall be marked legibly by the connectormanufacturer with his trade name
45、and the size designation orpart number.9. Keywords9.1 definitions; design test method; marking; material re-quirements acceptance criteria; product marking; resilientconnectorASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentio
46、nedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee an
47、d must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting o
48、f theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
49、 C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Shear Test RequirementsC923073
